add Apartmint to list of organizations

Author: davychiu

README.md

@@ -1519,6 +1519,7 @@
   - **Aan Zee**: [AanZee/javascript](https://github.com/AanZee/javascript)
   - **Airbnb**: [airbnb/javascript](https://github.com/airbnb/javascript)
   - **American Insitutes for Research**: [AIRAST/javascript](https://github.com/AIRAST/javascript)
+  - **Apartmint**: [apartmint/javascript](https://github.com/apartmint/javascript)
   - **Avalara**: [avalara/javascript](https://github.com/avalara/javascript)
   - **Compass Learning**: [compasslearning/javascript-style-guide](https://github.com/compasslearning/javascript-style-guide)
   - **DailyMotion**: [dailymotion/javascript](https://github.com/dailymotion/javascript)